yeha i figure ill take a look at it count the teeth,a nd see if i can find one with another tooth like say mine has 19 teeth and theni would find a 20 tooth gear, from what i've read a gear with one extra tooth should correct it

yeah, that's the issue, especially since ford probably didn't expect anybody to put "big" tires on my ranger when they designed it, yeah i read on some explore forum about the speedo gear, and that's were i read that if its slow you need another tooth on the gear, well i'll have to keep reseaching, maybe i'll find some kinda handy chart, and then from there find what vehicle might have it, does any body knows if one from an explorer will fit, since i have the same tire size as my dad's explore and i think that they are the same size ti came with and the exact tire code is P235/75R15

The Ranger and Explorer gears are the same, just be sure that you stay with manual gears because they are different from automatics. I showed you how to calculate EXACTLY what you need but you'll have to get the current gear size first. Just pull the VSS out and count the teeth or use the color code - easy.